Vertical well casing outer sand loss profile prediction and high-saturation gravel filling construction method

Abstract

The invention belongs to the technical field of oil and gas development and exploitation, particularly relates to the field of loose sandstone sand production oil and gas reservoirs, and particularlyrelates to a vertical well casing sand production loss profile prediction and high-saturation gravel filling construction method. The gravel filling construction method outside the vertical well casing comprises the following steps: predicting the loss of a longitudinal sand production profile of a production layer outside the vertical well casing; discriminating a heterogeneous mode of the sand production depletion profile; and a vertical well pipe external extrusion gravel packing pump injection program is designed. According to the construction method, the sand production deficit profile and the heterogeneity of the sand production deficit profile are fully considered, the sand production deficit zone is densely filled, the filling degree is greatly improved, high-saturation filling isachieved, and the sand prevention effect is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development and exploitation, in particular to the field of unconsolidated sandstone sand-producing oil-gas reservoirs, and specifically relates to a construction method for predicting sand deficit profiles outside vertical well pipes and filling highly saturated gravel. Background technique [0002] During the exploitation of unconsolidated sandstone oil and gas reservoirs, due to the weak cementation of unconsolidated sandstone oil and gas reservoir rocks, some fine sand particles will peel off under the action of in-situ stress and the erosion of fluids such as oil, gas and water, and enter the wellbore or flow to the ground with the fluid output, called Produce sand for oil and gas wells. During the production process, oil and gas reservoirs continuously produce formation sand grains, which will inevitably leave pores in the formation; severe or long-term sand production in the formation w...

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problems of lack of foundation, general construction and poor comprehensive effect in the existing extrusion filling construction, especially for vertical wells with severe sand production, obvious sand production deficit, and high saturation filling in formation outside the pipe. A construction method for predicting the sand production deficit profile outside the vertical well pipe and highly saturated gravel packing. The sand production deficit profile prediction method can clearly understand and grasp the sand production deficit profile outside the vertical well pipe, and obtain its longitudinal distribution law, which can be used for subsequent extrusion. The gravel filling construction provides a scientific and sufficient basis; the construction method fully considers the sand production deficit section and its heterogeneity, and fills the sand production deficit area compactly, greatly improving the filling degree, achieving high saturation filling, and improving sand control. Effect

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